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DeepTech

Experimenting With The 5.75" Concentric.

P

POLEWAGGER

New member
I had an interesting discovery with my brand new 5.75" concentric in the test garden.
After setting the GB just a touch positive, I buried a clad quarter just within reach of the mighty Cibola. (around 7")
Unable to get a peep without scraping the ground, I decided to lift her up a bit and fiddle with the GB. Who can guess which way I went (+-) to get it to start reporting at 1" above the ground?
This discovery almost makes me think that I uncovered a secret and shouldn't tell anybody because I haven't heard anything about this finding anywhere.
Is it possible that my ground is SO filled with iron I need to re think balancing different conditions?
I plan to see if the stock 8X9 yields the same results. This has got me a little exited since this could mean an extra inch in areas that I've already hit!
Hope to hear from some long time experienced detectorists who have experimented with multiple GB situations.
(beers = edits LOL)
 
It is impressive how deep the 5.75" coil can go for being such a small coil. I have both the widescan and the concentric for my Cibola. I just got the concentric not too long ago so I haven't used it much it in the field yet. I did compare it to the widescan in my test garden and it hits a little harder on the deeper targets than the widescan does. I'm not an expert and I'm always trying to learn and get better with my modded Cibola. It is such a great machine. Absolutely enjoy using it. What I have noticed in my soil is that the more negative GB I use the better depth I get. I've been doing Monte's power balancing technique and it really improves the depth in the silent search mode. I also discovered that the discriminate knob affects the GB for some reason on my machine. I was power balancing with the disc knob set at minimum and than adjusting it up to iron. Lost an inch or so of depth. Now I set my disc at iron after I find a clean patch of ground and than power balance. I can hit the clad quarter at 9" in my depth garden with the both the widescan and concentric 5.75" coils.
 
Don't know about "the more negative" but somewhat negative is certain to get more depth in my soil. (too neg. resulted in instability)
I'm very curious why I always hear "just a touch positive" when setting GB, when tests show the opposite to work better. EDIT :thumbdown:
Is this only true in high iron ground conditions?
Perhaps only YOUR OWN test garden will speak the truth?
Interesting how little input there is on this important controversy. Maybe I need to search a little more.
 
Monte talks about the Tesoro's having an offset ground balance in the silent search mode. He says that setting the ground balance in AM and than switching to the silent search mode that the GB will be a bit more positive. I find his theory to be correct. If I set GB to neutral in all metal than switch back to Silent Search it is on the positive side and I don't get the same depth. Power balancing offsets that. I pump the coil in Silent Search while negatively turning the GB knob till I start getting chatter and than slightly increase the positive till the chatter stops. This works well for me. If you check the GB in AM it is now on the negative side. By how much I don't know. Yeah, I wish there was more conversation on this topic as I am always trying to learn.
 
If you set it neg, the detector will likely false a lot more. Setting it balanced or slightly pos gives the detector more stability.
Its a trade off but others have reported the same -GB depth increase.
 
Qball said:
Monte talks about the Tesoro's having an offset ground balance in the silent search mode. He says that setting the ground balance in AM and than switching to the silent search mode that the GB will be a bit more positive. I find his theory to be correct. If I set GB to neutral in all metal than switch back to Silent Search it is on the positive side and I don't get the same depth. Power balancing offsets that. I pump the coil in Silent Search while negatively turning the GB knob till I start getting chatter and than slightly increase the positive till the chatter stops. This works well for me. If you check the GB in AM it is now on the negative side. By how much I don't know. Yeah, I wish there was more conversation on this topic as I am always trying to learn.
Click to expand...

Thanks for the heads up!
I missed that input from Monte.
Will do more testing now, armed with that info.
 
Polewagger, here is a great read from Monte posted a few weeks ago. Scroll down till you get to his reply.

http://www.findmall.com/read.php?17,1579996,1580628#msg-1580628
 
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